I used the microwave and it worked normally. Removed that food then placed more of the same in the unit and when I pressed start the word "door" appeared on the screen and it will not start. I have tried repeating it multiple times but not working. I have reset the power to it but still no help. I have someone scheduled to come out but it seems like it should be simple.

I found this question via a Google search and it is exactly the problem we are having. Unfortunately no answer. This is an in-wall over-microwave combination unit. The only numbers on the inside front of the unit are:
Tag on left side: 8538 791 54001 and under it XNR0568951
Tag on right side: UL FILE NO. E150072SP and under that FCC ID: KAW38AVM726

I'm sure this is likely a door latch sensor of some type, but where is it located and how difficult is it to replace.

I found this question via a Google search and it is exactly the problem we are having. Unfortunately no answer. This is an in-wall over-microwave combination unit. The only numbers on the inside front of the unit are:
Tag on left side: 8538 791 54001 and under it XNR0568951
Tag on right side: UL FILE NO. E150072SP and under that FCC ID: KAW38AVM726

I'm sure this is likely a door latch sensor of some type, but where is it located and how difficult is it to replace.

Thanks

If this is an over the range microwave then the name plate with the model number should be on the door frame. "XNR0568951" looks like a serial number. The model number should be somewhere around. Usually (if microwave made by Whirlpool) it starts with two or tree letters.

Whirlpool combination oven/microwave built-in unit.
Model # GMC275PDR07
When trying to start microwave, the electronic screen says "DOOR" and unit will not work. Oven still works fine.
I tried shutting down the power at the circuit breaker to see if it would re-set. No success.
Any other ideas?
Thanks!

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